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Related Concept Videos

High-Performance Liquid Chromatography: Elution Process01:05

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In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...
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High-Performance Liquid Chromatography: Instrumentation00:57

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High-performance liquid chromatography, or HPLC, is an analytical technique that separates liquid samples under high pressures. An HPLC instrument consists of glass bottles for storing solvents called mobile phase reservoirs. HPLC-grade solvents are used to maintain high purity, and the dissolved gases are removed using a degasser, such as a vacuum pumping system or sparging with helium. The solvents are then pumped into the analytical column using a screw-driven syringe or reciprocating pumps.
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Chromatographic Methods: Terminology01:18

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Chromatography is an analytical technique widely used in fields such as chemistry, biology, environmental science, and pharmaceuticals to separate the components of a mixture and identify substances between them. The process of chromatography is based on the interactions between two distinct phases: the stationary phase and the mobile phase. The stationary phase is fixed in place by a supporting material, while the mobile phase moves over it, carrying the solutes. As the mobile phase travels,...
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Gas Chromatography: Sample Injection Systems01:08

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In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
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High-Performance Liquid Chromatography: Introduction01:11

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High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
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High-Performance Liquid Chromatography: Types of Detectors01:15

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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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Needle time.

A Tattam

    Nursing Standard (Royal College of Nursing (Great Britain) : 1987)
    |June 21, 2016
    PubMed
    Summary
    This summary is machine-generated.

    The unsafe injection practices of drug users are a major cause of death for addicts. This population is now identified as the primary driver of heterosexual AIDS transmission.

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    Area of Science:

    • Public Health
    • Epidemiology
    • Infectious Diseases

    Background:

    • Intravenous drug use has historically been linked to significant mortality among addicts.
    • The risk of disease transmission through shared or contaminated injection equipment is well-documented.

    Purpose of the Study:

    • To highlight the role of intravenous drug users in the spread of Acquired Immune Deficiency Syndrome (AIDS).
    • To identify the primary transmission routes of a potential heterosexual AIDS epidemic.

    Main Methods:

    • Review of existing epidemiological data on drug use and HIV transmission.
    • Analysis of transmission dynamics within the heterosexual population.

    Main Results:

    • Intravenous drug users represent a critical reservoir for HIV.
    • The study identifies this group as the most probable origin for heterosexual AIDS transmission.

    Conclusions:

    • Addressing unsafe injection practices among drug users is crucial for controlling HIV spread.
    • Public health interventions must target this population to prevent a widespread heterosexual AIDS epidemic.